Modify all irq hw handler so that end() can work with probe_irq_on()
and potentially SMP machines.

Thanks to Jim Paris bug report.

Jun

diff -Nru oss-link/arch/mips/ddb5xxx/ddb5477/irq_5477.c.orig oss-link/arch/mips/ddb5xxx/ddb5477/irq_5477.c
--- oss-link/arch/mips/ddb5xxx/ddb5477/irq_5477.c.orig	Thu Oct 11 14:38:55 2001
+++ oss-link/arch/mips/ddb5xxx/ddb5477/irq_5477.c	Tue Oct 30 10:35:55 2001
@@ -85,7 +85,8 @@
 	db_assert(irq >= vrc5477_irq_base);
 	db_assert(irq < vrc5477_irq_base + NUM_5477_IRQ);
 
-	ll_vrc5477_irq_enable( irq - vrc5477_irq_base);
+	if(!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
+		ll_vrc5477_irq_enable( irq - vrc5477_irq_base);
 }
 
 hw_irq_controller vrc5477_irq_controller = {
diff -Nru oss-link/arch/mips/ddb5xxx/ddb5476/vrc5476_irq.c.orig oss-link/arch/mips/ddb5xxx/ddb5476/vrc5476_irq.c
--- oss-link/arch/mips/ddb5xxx/ddb5476/vrc5476_irq.c.orig	Thu Oct 11 14:38:55 2001
+++ oss-link/arch/mips/ddb5xxx/ddb5476/vrc5476_irq.c	Tue Oct 30 10:38:29 2001
@@ -45,7 +45,11 @@
 	nile4_disable_irq(irq - irq_base);
 }
 
-#define	vrc5476_irq_end		vrc5476_irq_enable
+static void vrc5476_irq_end(uint irq)
+{
+	if(!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
+		vrc5476_irq_enable(irq);
+}
 
 static hw_irq_controller vrc5476_irq_controller = {
 	"vrc5476",
diff -Nru oss-link/arch/mips/kernel/irq_cpu.c.orig oss-link/arch/mips/kernel/irq_cpu.c
--- oss-link/arch/mips/kernel/irq_cpu.c.orig	Wed Sep 26 15:52:32 2001
+++ oss-link/arch/mips/kernel/irq_cpu.c	Tue Oct 30 10:34:25 2001
@@ -65,7 +65,8 @@
 static void
 mips_cpu_irq_end(unsigned int irq)
 {
-	mips_cpu_irq_enable(irq);
+	if(!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
+		mips_cpu_irq_enable(irq);
 }
 
 static hw_irq_controller mips_cpu_irq_controller = {
diff -Nru oss-link/arch/mips/vr4181/common/irq.c.orig oss-link/arch/mips/vr4181/common/irq.c
--- oss-link/arch/mips/vr4181/common/irq.c.orig	Tue Oct  2 16:27:11 2001
+++ oss-link/arch/mips/vr4181/common/irq.c	Tue Oct 30 10:53:43 2001
@@ -77,7 +77,13 @@
 
 #define sys_irq_shutdown	sys_irq_disable
 #define sys_irq_ack		sys_irq_disable
-#define sys_irq_end		sys_irq_enable
+
+static void
+sys_irq_end(unsigned int irq)
+{
+	if(!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
+		sys_irq_enable();
+}
 
 static hw_irq_controller sys_irq_controller = {
 	"vr4181_sys_irq",
@@ -148,7 +154,12 @@
 	}
 }
 
-#define gpio_irq_end		gpio_irq_enable
+static void
+gpio_irq_end(unsigned int irq)
+{
+	if(!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
+		gpio_irq_enable(irq);
+}
 
 static hw_irq_controller gpio_irq_controller = {
 	"vr4181_gpio_irq",